Well, that kind of glasses have become very popular in the world. And I think they are suitable for rob bell because of his looks. Actually, you could see various types of those black glasses over Amazon, which is a good place to pick up them at a low price. Typically a pair of them is worth 20 dollars.
The black glasses that rob bell wears is really good at the design which may cost a lot of money. If you like such type, you could go to the online store to buy the similar type at the black color. You could go to the amazon to have a look because there are many different kinds of glasses. You may have the favor there. And the price there is relatively cheap.
I found he was so cool and charming with black glasses. Black frames are the most popular ones around the world because of classical and elegant black. I consider that ebay may do you a favor. As we all known that ebay is one of the biggest online retailers around the world and you can almost find everything you wanna on this site included eyeglasses and contact lenses.